| A | B |
|---|
| Alps | Central Europe; tourist haven for world leaders |
| Andes | longest mountain in the world |
| Appalachian mountains | barrier to the westward expansion of the British Colonies |
| Caucasus mountains | arena for political, military, religious, and cultural rivalries and expansionism for centuries |
| Great Dividing range | obstacle to exploration and settlement by the British settler |
| Himalayas | natural barrier to the movement of people for tens of thousands of years |
| Rocky mountains | U.S. government acquired it in the Louisiana Purchase of 1803 |
| Ural mountains | considered the natural boundary between Europe and Asia |
| Mojave desert | largest desert in the USA and consists of Death Valley |
| Atacama desert | covers a third of chile; highest and coolest desert in the world |
| Sahara desert | worlds largest hot desert and very sparsely populated in Africa |
| Syrian desert | largest desert in Middle East |
| Great Victoria desert | largest desert in Australia |
